Double exposure - On a mobile phone!

I've acquired a new mobile (i)Phone recently, and it has way more fun things to play with, that my old phone, so I thought I'd try out a double exposure.  I downloaded a wallpaper (of a warm, sunny, far away place) then used the 'Photoblend' app to merge it with a picture of my daughter - here is the result:

Not a great example as the horizon line is very prominently stretching across the forehead, and the two images aren't really related. But, trying this out has made me want to give it a go in Photoshop with some other images!